| Reference Type | Journal (article/letter/editorial) |
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| Title | Determination of 2V from one extinction curve and its related n0 curve |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Joel, N. | Author |
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| Year | 1963 (December) | Volume | 33 |
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| Issue | 263 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-263-679.pdf+ |
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| DOI | doi:10.1180/minmag.1963.033.263.05Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5768 | Long-form Identifier | mindat:1:5:5768:8 |
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| GUID | 0 |
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| Full Reference | Joel, N. (1963) Determination of 2V from one extinction curve and its related n0 curve. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (263) 679-692 doi:10.1180/minmag.1963.033.263.05 |
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| Plain Text | Joel, N. (1963) Determination of 2V from one extinction curve and its related n0 curve. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (263) 679-692 doi:10.1180/minmag.1963.033.263.05 |
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| In | (1962) Mineralogical Magazine Vol. 33 (263) Mineralogical Society |
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| Abstract/Notes | SummaryFrom the extinction curve of a biaxial crystal mounted on a spindle stage (or one-axis stage goniometer), the related n0 curve can be derived and drawn on the stereogram. The n0 curve is the equivibration curve—or constant-refractive-index curve—that goes through the projection P0 of the spindle-stage axis. After the principal diameters (maximum 2η and minimum 2ζ) of the no curve have been measured, the angle 2V may be calculated by means of the formula cos V = sin ζ/sin η. This method can also be used for determining—or refining—the directions of the principal axes α, β, γ. |
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